* Are you experiencing lag? - Stop Google Talk Service
Go to Settings -> Applications -> Manage applications -> Google Talk Service -> click "Force Stop"
* Are you still experiencing lag? - close all widgets that's running.
* Are you still experiencing lag?
-plug in usb cable from phone to PC and run adb logcat
-run cps2 and find out which application(s) is poping up during game play.
-try to "Force Stop" that application(s)
* Are you STILL experiencing lag? - Try to "Force Stop" Calendar and Checkin Service
But for this one, you might have to restart your phone after playing.